Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1978-04-04
1980-04-08
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
29577C, 29578, 148 15, 148187, 357 35, 357 36, 357 44, 357 46, 357 92, H01L 2122, H01L 2704, H01L 2972
Patent
active
041971477
ABSTRACT:
A method of manufacturing an integrated circuit including an analog circuit and an I.sup.2 L circuit which both contain NPN transistors on a P-type semiconductor chip in which the method includes an N.sup.+ diffusion step for producing a flat diffusion for certain NPN transistors having smaller penetration depth than N.sup.+ regions of the other NPN transistors for connection of an emitter electrode to the said certain NPN transistors.
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patent: 3566218 (1971-02-01), Widlar et al.
patent: 3770519 (1973-11-01), Wiedmann
patent: 3810123 (1974-05-01), Baitinger et al.
patent: 3969748 (1976-07-01), Horie et al.
patent: 4043849 (1977-08-01), Kraft et al.
patent: 4087900 (1978-05-01), Yiannoulos
Jakits, V. O., "Integrierte Injektion Slogik . . . " Valvo Berichte, vol. XVIII, Book 1/2, pp. 215-226, Apr. 1974.
Berger et al., "Integrated Transistor . . . Variable-Current Amplification" I.B.M. Tech. Discl. Bull., vol. 15, No. 5, Oct. 1972, p. 1625.
Bergmann Gunther
Clauss Hermann
Dean R.
Licentia Patent-Verwaltungs-G.m.b.H
Saba W. G.
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